UC flashcards

Transaction

A request and its matching responses.

Source: RFC 3261, SIP

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Dialog

A peer relationship identified by Call-ID and tags.

Source: RFC 3261, SIP

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SIP transactions and dialogs

A transaction pairs a request with its responses.

Source: RFC 3261, SIP

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A 180 Ringing means the call was answered.

False. False. It means alerting. The 200 accepts the session.

Source: RFC 3261, SIP

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ACK for a 2xx is optional.

False. False. Without ACK the far end retransmits the 200 and can drop the call.

Source: RFC 3261, SIP

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Early offer

SDP in the INVITE.

Source: RFC 3264, offer/answer

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Delayed offer

SDP offered in the reliable response or the 200.

Source: RFC 3264, offer/answer

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Offer and answer

SDP is the offer or the answer, not a second signaling protocol you ignore.

Source: RFC 3264, offer/answer

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The answer may add a codec the offer did not list.

False. False. The answer narrows the offer.

Source: RFC 3264, offer/answer

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AOR

The address-of-record being registered.

Source: RFC 3261, SIP

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Contact

The device URI to try later.

Source: RFC 3261, SIP

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Registration

REGISTER publishes a Contact. It does not place a call.

Source: RFC 3261, SIP

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REGISTER creates a voice session.

False. False. It stores a Contact binding.

Source: RFC 3261, SIP

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PRACK

Acknowledgement of a reliable provisional response.

Source: RFC 3262, PRACK

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100rel

The extension that makes selected 1xx responses reliable.

Source: RFC 3262, PRACK

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Early media and PRACK

183 Session Progress can carry SDP before answer.

Source: RFC 3262, PRACK

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Hearing ringback proves the called party answered.

False. False. Ringback can be early media.

Source: RFC 3262, PRACK

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Partition

A group of patterns with the same reachability.

Source: Cisco Unified Communications Manager product support

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CSS

An ordered list of partitions.

Source: Cisco Unified Communications Manager product support

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Partitions and calling search spaces

A partition is a bucket of patterns.

Source: Cisco Unified Communications Manager product support

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CUCM searches every partition and picks the longest match across all of them.

False. False. It walks the CSS in order.

Source: Cisco Unified Communications Manager product support

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Route pattern

Digits in a partition that point at a gateway or route list.

Source: Cisco Unified Communications Manager product support

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Route list

An ordered set of route groups.

Source: Cisco Unified Communications Manager product support

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Route patterns, lists, and groups

A route pattern matches digits.

Source: Cisco Unified Communications Manager product support

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A route group is a list of partitions.

False. False. It is a list of gateways or trunks.

Source: Cisco Unified Communications Manager product support

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Translation pattern

A pattern that transforms digits and can continue routing.

Source: Cisco Unified Communications Manager product support

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Mask

A digit rewrite applied to a number field.

Source: Cisco Unified Communications Manager product support

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Transformations

Called, calling, and redirecting numbers are different fields.

Source: Cisco Unified Communications Manager product support

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The calling number and the called number are the same field.

False. False.

Source: Cisco Unified Communications Manager product support

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SIP trunk

CUCM's signaling peer toward a gateway or another call agent.

Source: Cisco Unified Communications Manager product support

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SIP profile

Timers, OPTIONS, and offer behavior for that trunk.

Source: Cisco Unified Communications Manager product support

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SIP trunks on CUCM

The trunk, the SIP profile, and the security profile are three objects.

Source: Cisco Unified Communications Manager product support

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A SIP trunk in service proves the route pattern points at it.

False. False. Routing and status are separate.

Source: Cisco Unified Communications Manager product support

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Dial peer

An IOS rule that matches a call and names a target.

Source: Cisco Unified Border Element product support

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Preference

A tie-break after match length.

Source: Cisco Unified Border Element product support

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Dial peers

A dial peer matches an incoming or outgoing call.

Source: Cisco Unified Border Element product support

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Outbound dial-peer preference is consulted before match length.

False. False. Longest match comes first when hunt is the default.

Source: Cisco Unified Border Element product support

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B2BUA

A user agent that sits between two dialogs.

Source: Cisco Unified Border Element product support

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Media anchor

RTP terminates on the SBC.

Source: Cisco Unified Border Element product support

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CUBE as a B2BUA

CUBE terminates one dialog and starts another.

Source: Cisco Unified Border Element product support

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CUBE forwards one SIP dialog unchanged, like a proxy.

False. False. It is a B2BUA.

Source: Cisco Unified Border Element product support

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SRST

Fallback call processing on the branch router.

Source: Cisco Unified SRST product support

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Re-home

Phones returning to CUCM after the WAN recovers.

Source: Cisco Unified SRST product support

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SRST

SRST is the fallback when phones cannot reach CUCM.

Source: Cisco Unified SRST product support

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SRST automatically clones every CUCM hunt pilot.

False. False.

Source: Cisco Unified SRST product support

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Local gateway

The premises SBC that connects Webex Calling to PSTN or a PBX.

Source: Webex Help

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Certificate trunk

A trunk that authenticates with a certificate instead of a registration.

Source: Webex Help

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Local gateway toward Webex Calling

The local gateway is how premises PSTN or a PBX meets Webex Calling.

Source: Webex Help

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A local gateway registration is the same object as a CUCM phone registration.

False. False. It is the trunk from CUBE toward Calling.

Source: Webex Help

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Traversal zone

The zone that joins Expressway-C and Expressway-E.

Source: Cisco Expressway Series product support

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Expressway-E

The edge server.

Source: Cisco Expressway Series product support

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Expressway-C and Expressway-E

Expressway-C lives on the inside, next to CUCM.

Source: Cisco Expressway Series product support

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Every CUCM call must pass through Expressway.

False. False.

Source: Cisco Expressway Series product support

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MRA

Mobile and Remote Access through Expressway.

Source: Cisco Expressway Series product support

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SRV

A DNS record the client uses to find the edge.

Source: Cisco Expressway Series product support

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Mobile and Remote Access

MRA lets a remote Cisco phone or Jabber register to CUCM through the Expressway pair.

Source: Cisco Expressway Series product support

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MRA replaces CUCM as the registrar.

False. False. CUCM remains the registrar.

Source: Cisco Expressway Series product support

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Traversal media

The UDP range Expressway uses for remote media.

Source: Cisco Expressway Series product support

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Signaling

SIP or the HTTPS path used to register.

Source: Cisco Expressway Series product support

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Firewall and traversal

Open the ports your version's guide lists.

Source: Cisco Expressway Series product support

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A completed INVITE proves the firewall allows RTP.

False. False.

Source: Cisco Expressway Series product support

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EF

Expedited Forwarding, DSCP 46.

Source: RFC 3246, Expedited Forwarding

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Trust boundary

The place you decide to keep or rewrite a mark.

Source: RFC 3246, Expedited Forwarding

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DSCP and the trust boundary

Voice RTP is commonly marked EF, DSCP 46.

Source: RFC 3246, Expedited Forwarding

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EF and CS3 are the same mark.

False. False. EF is DSCP 46. CS3 is a different codepoint.

Source: RFC 3246, Expedited Forwarding

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LLQ

A queue that serves a priority class up to a configured rate.

Source: ITU-T G.114, one-way transmission time

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Packetization

The time to fill one RTP payload.

Source: ITU-T G.114, one-way transmission time

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LLQ and the delay budget

Priority queue bandwidth is a limiter for the EF class.

Source: ITU-T G.114, one-way transmission time

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LLQ adds bandwidth to a circuit.

False. False. It schedules the bandwidth you already have.

Source: ITU-T G.114, one-way transmission time

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Location

A CUCM bandwidth domain for admission control.

Source: Cisco Unified Communications Manager product support

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CAC

Call admission control, the decision to allow a call.

Source: Cisco Unified Communications Manager product support

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Locations and call admission control

A CUCM location names a bandwidth budget between sites.

Source: Cisco Unified Communications Manager product support

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CUCM locations mark RTP as EF.

False. False.

Source: Cisco Unified Communications Manager product support

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CVP

Customer Voice Portal, the voice browser and call-control front in many designs.

Source: Cisco Unified Contact Center Enterprise product support

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ICM

The routing brain in UCCE.

Source: Cisco Unified Contact Center Enterprise product support

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UCCE from carrier to agent

Ingress, routing, queue treatment, and the agent are different stages.

Source: Cisco Unified Contact Center Enterprise product support

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Queue music means an agent phone is ringing.

False. False. Treatment happens before delivery.

Source: Cisco Unified Contact Center Enterprise product support

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Label

The destination the script returns.

Source: Cisco Unified Contact Center Enterprise product support

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Peripheral gateway

The process that represents CUCM devices to ICM.

Source: Cisco Unified Contact Center Enterprise product support

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The CUCM bridge into UCCE

Agents are CUCM endpoints.

Source: Cisco Unified Contact Center Enterprise product support

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A successful ICM script guarantees CUCM can ring the phone.

False. False.

Source: Cisco Unified Contact Center Enterprise product support

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Flow

The routing document in Webex Contact Center.

Source: Cisco Unified Contact Center Enterprise product support

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Script

The routing document in ICM.

Source: Cisco Unified Contact Center Enterprise product support

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Webex Contact Center beside UCCE

Webex Contact Center and UCCE are different products.

Source: Cisco Unified Contact Center Enterprise product support

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An ICM script runs unchanged inside Webex Contact Center.

False. False.

Source: Cisco Unified Contact Center Enterprise product support

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Dedicated Instance

A hosted CUCM offer inside the Webex cloud contract.

Source: Webex Help

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Control Hub

The admin place for Webex Calling locations and numbers.

Source: Webex Help

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Webex Calling and Dedicated Instance

Multi-tenant Webex Calling and Dedicated Instance are different offers.

Source: Webex Help

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Dedicated Instance uses the same dial-plan objects as multi-tenant Calling.

False. False.

Source: Webex Help

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Dual-run

Old and new paths both available for a number during a test.

Source: Webex Help

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Rollback

Returning the number to the path you saved.

Source: Webex Help

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Dual-run and rollback

Move one number you can give back.

Source: Webex Help

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A carrier port can always be undone in five minutes.

False. False. Confirm the porting rules.

Source: Webex Help

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Survivability gateway

A local gateway mode that keeps selected Calling users up during a cloud outage.

Source: Webex Help

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Fallback test

A planned failure of the primary path.

Source: Webex Help

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Survivability during cutover

Cloud calling needs a plan for when the cloud path is down.

Source: Webex Help

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SRST protects Webex Calling apps with no extra design.

False. False.

Source: Webex Help

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Hypothesis

The single fault you are testing.

Source: Cisco Unified Communications Manager product support

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Evidence pack

The traces and notes that show the test.

Source: Cisco Unified Communications Manager product support

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One hypothesis, one change

Say what you think is broken, in one sentence.

Source: Cisco Unified Communications Manager product support

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Changing the CSS, the codec, and the gateway in one window is a clean test.

False. False.

Source: Cisco Unified Communications Manager product support

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Ladder

A drawing of messages between named boxes.

Source: RFC 3261, SIP

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Cause

The reason phrase or Q.850 cause on a failure.

Source: RFC 3261, SIP

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Reading a ladder

One leg at a time.

Source: RFC 3261, SIP

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Two Call-IDs mean the trace is corrupt.

False. False. A B2BUA creates two dialogs.

Source: RFC 3261, SIP

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SDP c= line

The address where media should be sent.

Source: RFC 3550, RTP

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One-way audio

Media in a single direction.

Source: RFC 3550, RTP

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One-way audio

Signaling can be perfect while RTP fails in one direction.

Source: RFC 3550, RTP

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A 200 OK with SDP proves two-way audio.

False. False.

Source: RFC 3550, RTP

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MLTS

A multi-line telephone system, the term the FCC page uses for enterprise and hotel phone systems.

Source: FCC, Kari's Law and RAY BAUM'S Act for multi-line telephone systems

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Dispatchable location

The FCC page's term for a validated street address plus detail needed to find the caller.

Source: FCC, Kari's Law and RAY BAUM'S Act for multi-line telephone systems

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Direct dial, notification, and location

This page is study material, not legal advice and not an emergency plan.

Source: FCC, Kari's Law and RAY BAUM'S Act for multi-line telephone systems

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Kari's Law, as the FCC page describes it, is satisfied by requiring users to dial 9 before 911.

False. False. The page says direct dialing means no prefix or access code such as 9.

Source: FCC, Kari's Law and RAY BAUM'S Act for multi-line telephone systems

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This lab page is legal advice for every country.

False. False. It is a study note about pages that were opened. Confirm the rule where you operate.

Source: FCC, Kari's Law and RAY BAUM'S Act for multi-line telephone systems

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ERL

Emergency response location. The zone Emergency Responder binds to a switch port.

Source: Cisco Emergency Responder product support

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ELIN

Emergency location identification number. The callback number sent for that zone.

Source: Cisco Emergency Responder product support

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Emergency Responder, ERL, and ELIN

Cisco Emergency Responder is a separate product. The support page opened here lists Release 15 as available, with a release date of 16 October 2023.

Source: Cisco Emergency Responder product support

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An ELIN is the caller's directory number.

False. False. The CUCM chapter describes the ELIN as the number Emergency Responder uses for routing and PSAP callback, mapped back to the extension.

Source: Cisco Emergency Responder product support

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A phone on a switch Emergency Responder does not know is still located.

False. False. The planning chapter calls those phones unlocated.

Source: Cisco Emergency Responder product support

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PSAP

Public safety answering point. The Wikipedia article describes it as the call center that answers the emergency call.

Source: Cisco Emergency Responder Administration Guide, Release 15

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On-site alert

The Emergency Responder notification path named in the Release 15 administration guide.

Source: Cisco Emergency Responder Administration Guide, Release 15

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On-site alert, callback, and what this lab will not decide

The Release 15 administration guide contents include on-site alerts, off-premises users, and a national E911 service provider. Those are different chapters.

Source: Cisco Emergency Responder Administration Guide, Release 15

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An outbound 911 test proves PSAP callback.

False. False. Callback is a separate call toward the ELIN.

Source: Cisco Emergency Responder Administration Guide, Release 15

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Built-in bridge

The phone feature CUCM uses when the phone itself forks recording media.

Source: Feature Configuration Guide for CUCM, Release 15, Recording

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Fork

A copy of the media stream sent to a recorder.

Source: Feature Configuration Guide for CUCM, Release 15, Recording

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Phone fork and network fork

The CUCM 15 feature guide says phone-based recording takes media from the phone. The phone forks two streams to the recording server.

Source: Feature Configuration Guide for CUCM, Release 15, Recording

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A 200 OK proves the recorder received both audio directions.

False. False. The fork is a separate media path.

Source: Feature Configuration Guide for CUCM, Release 15, Recording

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The built-in bridge on one phone always follows the cluster-wide parameter.

False. False. The feature guide says the phone setting overrides the cluster default when default is not selected.

Source: Feature Configuration Guide for CUCM, Release 15, Recording

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SRC

Session recording client. The CUBE guide says CUBE takes this role when SIPREC is configured.

Source: RFC 7245, architecture for media recording using SIP

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SRS

Session recording server. RFC 7865 describes metadata from the server's point of view.

Source: RFC 7245, architecture for media recording using SIP

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SIPREC and CUBE as the recording client

RFC 7245 describes architectures for recording in a SIP environment by sending a copy of a media stream to a recording device.

Source: RFC 7245, architecture for media recording using SIP

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The recording INVITE is the same dialog as the call being recorded.

False. False. SIPREC is a separate recording session.

Source: RFC 7245, architecture for media recording using SIP

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Recording file

The stored copy of the media.

Source: RFC 7245, architecture for media recording using SIP

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Quality score

A review of a call. It is not the media file.

Source: RFC 7245, architecture for media recording using SIP

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Compliance is a reason, not a setting

RFC 7245 says some environments record every call for regulatory, compliance, and consumer-protection reasons.

Source: RFC 7245, architecture for media recording using SIP

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RFC 7245 chooses the retention period for your contact center.

False. False. It explains recording architectures. It does not set your policy.

Source: RFC 7245, architecture for media recording using SIP

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SIP trunk

The signaling peer between two call agents or between a PBX and a provider.

Source: SIP trunking (Wikipedia)

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SIPconnect

The SIP Forum's technical recommendation for IP peering with a VoIP provider.

Source: SIP trunking (Wikipedia)

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A SIP trunk is a peer, not a brand

Wikipedia's SIP trunking article describes a SIP service between a provider and a customer's SIP PBX.

Source: SIP trunking (Wikipedia)

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One SIP trunk means both PBXs share one dial plan.

False. False. Each side matches the digits with its own rules.

Source: SIP trunking (Wikipedia)

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Dialplan

The Asterisk or FreeSWITCH rules that match a call. Not a CUCM CSS.

Source: Asterisk (Wikipedia)

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res_pjsip

The Asterisk SIP channel stack named in the documentation opened for this lab.

Source: Asterisk (Wikipedia)

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Asterisk and FreeSWITCH as the other PBX

Wikipedia describes Asterisk as a software PBX that connects phones, the PSTN, and VoIP endpoints.

Source: Asterisk (Wikipedia)

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An Asterisk dialplan is a CUCM calling search space.

False. False. It is a different object on a different product.

Source: Asterisk (Wikipedia)

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WebRTC

Browser real-time communication. The W3C recommendation is the API. RFC 8825 points at the protocol suite.

Source: WebRTC (Wikipedia)

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JSEP

JavaScript Session Establishment Protocol, RFC 8829.

Source: WebRTC (Wikipedia)

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WebRTC, SIP over WebSocket, and a hosted bridge

Wikipedia describes WebRTC as browser and mobile APIs for real-time audio and video without a plugin.

Source: WebRTC (Wikipedia)

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A WebRTC page is a CUCM SIP phone.

False. False. Something has to translate, unless the far end also speaks WebRTC.

Source: WebRTC (Wikipedia)

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RFC 8829 replaces SIP.

False. False. It describes JavaScript control of the signaling plane and how that relates to existing signaling.

Source: WebRTC (Wikipedia)

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